Biodegradable PHBH Laminate Layers for Warpage and Mold Blocking Control
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Solution Overview
Problem
Biodegradable laminated articles using PHBH face issues with warpage due to insufficient water absorption, poor bonding, and blocking during molding, especially when heated, leading to reduced production efficiency and quality.
Innovation Solution
A biodegradable laminated article with a substrate layer and thermoplastic resin layers on both sides, where one resin layer has a weight per unit area of 10 to 200 g/m² and the other 0.1 to 5 g/m², allowing for high water absorbency, reduced mold blocking, and effective bonding at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PHBH is thoroughly heated to a temperature well above its melting point to achieve high-quality bonding, then bond performance is improved, but the time taken for resin solidification increases and production rate decreases
Solution Approach 1:
The patent applies parameter changes by modifying the molecular weight of PHBH to alter its flow and bonding characteristics. By using PHBH with a specific molecular weight range (1.5×10^5 to 6.5×10^5), the resin achieves optimal bonding performance at lower temperatures, reducing heating time and improving production rate while maintaining strong bonds.
Solution Approach 2:
The patent implements dynamics by controlling the molecular weight distribution and melt viscosity of PHBH to achieve optimal flow characteristics during heating. This dynamic control allows the resin to spread and bond effectively at lower temperatures, reducing the time required for solidification and improving overall production efficiency.
2Shape
If water is applied to the laminated article to correct warpage, then warpage removal is attempted, but the substrate cannot absorb water sufficiently to remove warpage satisfactorily
Solution Approach 1:
The patent applies local quality by creating an asymmetric structure with different resin layer weights on each side of the substrate. This asymmetric configuration (10-200 g/m² on one side, 0.1-5 g/m² on the other) provides localized water absorption capacity that effectively corrects warpage while maintaining the structural integrity and flatness of the laminated article.
3Strength
If the resin layer on the outside of the cup is heated during molding, then bonding is achieved, but the resin layer becomes sticky and experiences blocking to the mold
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight and weight per unit area of the resin layers to control melting and bonding behavior. The specific weight range (10-200 g/m² for the first layer, 0.1-5 g/m² for the second layer) ensures that bonding occurs at lower temperatures, preventing excessive stickiness and mold blocking while achieving strong bonds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The laminated article effectively removes warpage, reduces mold blocking, and maintains high bond performance even at low heat sealing temperatures, enhancing production efficiency and quality.
Implementation Method 1
the substrate cannot absorb the water sufficiently to remove the warpage satisfactorily
Implementation Method 2
PHBH needs to be thoroughly heated up to a temperature well above its melting point
Implementation Method 3
the viscosity of PHBH does not readily decrease during melting by heating
Data Source
AI summary
A biodegradable laminated article includes: a substrate layer; a first thermoplastic resin (A1) layer located on one side of the substrate layer and containing a polyhydroxyalkanoate resin; and a second thermoplastic resin (A2) layer located on the other side of the substrate layer and containing a polyhydroxyalkanoate resin. The weight per unit area of the first thermoplastic resin (A1) layer is from 10 to 200 g/m2, and the weight per unit area of the second thermoplastic resin (A2) layer is from 0.1 to 5 g/m2.